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power gating in rush current simulation

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wyyshaken

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hello, everyone

when doing power gating design, i have no idea about how to simulate the in-rush curret in one of my power domains.

could anyone tell me how to simulate in-rush current and which tools you use.

thanks a lot.

B.R.

Y
 

Try Encounter Power System from Cadence.
 

Thanks for your replay.

But can your explain it a little more detail?

Thanks.
 

wyyshaken said:
Thanks for your replay.

But can your explain it a little more detail?

Thanks.
Click to expand...

The Encounter Power System from Cadence enables static and dynamic distributed power calculation, and static and dynamic power rail analysis. In the dynamic solution, they can execute simulation of a block as it powers up, so that you can see the impact of rush current.
Typically the number of power switches is determined from your max IR drop requirements, the rush current needs to be managed by sequencing-on the switches ... increasing delay reduces rush current, decreasing delay increases rush current.
In addition to looking at rush current, you might also want to look at the impact that the power-up has on surrounding logic, high rush current can cause local IR drop on surrounding logic. I believe that the Encounter Power System can do this too.
 
petemc said:
The Encounter Power System from Cadence enables static and dynamic distributed power calculation, and static and dynamic power rail analysis. In the dynamic solution, they can execute simulation of a block as it powers up, so that you can see the impact of rush current.
Typically the number of power switches is determined from your max IR drop requirements, the rush current needs to be managed by sequencing-on the switches ... increasing delay reduces rush current, decreasing delay increases rush current.
In addition to looking at rush current, you might also want to look at the impact that the power-up has on surrounding logic, high rush current can cause local IR drop on surrounding logic. I believe that the Encounter Power System can do this too.
Click to expand...

thanks for your kindly reply
 

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